<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>jQuery 事件处理函数和事件对象</title>
    <style>
        section {
            background-color: #ddd;
            padding: 40px;
        }
    </style>
</head>
<body>
    <section>
        <button id="button">点击切换背景颜色</button>
    </section>

    <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
</body>
</html>